Transmission ratio control system for an infinitely variable tra

Details Transmission ratio control system for an infinitely variable tra Transmission ratio control system for an infinitely variable tra

1985-08-12

1988-03-15

Staab, Lawrence

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74877, B60K 4112

Patent

active

047305231

ABSTRACT:
A system for an infinitely variable belt-drive transmission for an engine comprises a primary pulley having a hydraulically shiftable disc, a secondary pulley having a hydraulically shiftable disc, a belt engaged with both pulleys, and a hydraulic circuit. A transmission ratio control valve having a spool is provided to be responsive to engine speed for controlling the oil and for shifting the disc of the primary pulley to change the transmission ratio. Pitot pressure dependent of the engine speed is applied to the spool to shift it against a spring, the force of which is determined by the depression of an accelerator pedal. The load on the spring is increased to provide a downshifting operation of the transmission, when the large transmission ratio range is selected.

REFERENCES:
patent: 3893344 (1975-07-01), Dantgraber et al.
patent: 4369675 (1983-01-01), van Deursen
patent: 4400164 (1983-08-01), Cadee
patent: 4467674 (1984-08-01), van Deursen et al.
patent: 4475416 (1984-10-01), Underwood
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4579021 (1986-04-01), Yamamuro et al.
patent: 4584909 (1986-04-01), Abo et al.

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